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Solving Systems of Equations with Fractions or Decimals

Videos, worksheets, examples and solutions to help Algebra 1 students learn how to solve systems of linear equations with fractions.



 
How to solve systems of equations with fractions?
When a system includes an equation with fractions as coefficients:
Step 1. Eliminate the fractions by multiplying each side of the equation by a common denominator.
Step 2: Solve the resulting system using the addition method, elimination method, or the substitution method.

The following diagrams show how to solve systems of equations using the Substitution Method and the Elimination Method.

System of Equations Substitution

System of Equations Elimination

Systems of Equations with Fractions
Students learn to solve systems of linear equations that involve fractions. Students also learn to solve linear systems of equations by the method of their choice using the following rules: if one of the variables cancels out when the equations are added together, then use addition, and if a variable is already isolated in one of the equations, then use substitution.
Example:
Solve the following systems of equations
y = 1/3 x - 1
3x - 2y = 4



Solving a System Involving Fractions with Substitution
How to solve a system of 2 equations with 2 variables involving fractions using substitution?
Example:
y = -3/4 x + 12
y = 1/3 x - 2 Solving a System Involving Fractions with Elimination
How to solve a linear system by the process of elimination where the equations contain fractions?
Example:
x/2 + y/8 = 4
x/3 - y/2 = -2 Solving systems of linear equations involving decimals and fractions
1. Scale the system so that integer coefficients exist.
2. Use elimination to solve for the solutions, if they exist.

Examples:
System 1
0.05x - 0.03y = 0.21
0.07x + 0.02y = 0.16

System 2
x/4 + y/6 = 1
x - y = 3

System 3
(x + 3)/4 + (y - 1)/3 = 1
2x - y = 1

Solving System Of Linear Equations by Adding (with decimals)
Example:
3.5x + 2.5y = 17
-1.5x - 7.5y = -33 Solving Systems of Linear Equations with Fractions
Solve a system of linear equations using multiplication with addition or subtraction.
Example:
x/2 + y/3 = -4
x/5 + y/5 = -2

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.


You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.


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